Abstract
Natural transformation refers to the process in which bacteria acquire new traits by uptaking naked DNA from the environment and integrating it into their genome through homologous recombination when they are in the specialized physiological state of competence. The natural transformation was first described in Streptococcus pneumoniae. Since Frederick Griffith first described natural transformations in S. pneumoniae in 1928, this phenomenon has been studied extensively. Induction of competence before natural transformation has been reported to involve about 10% of the pneumococcal genome. In addition to natural transformation, multiple physiological processes are involved, including biofilm formation, bacteriocin production, and fratricide. In this review, we summarized current knowledge about natural transformation in S. pneumoniae and described its competence regulation mechanism. This review also introduces the development of novel drugs and vaccines against S. pneumoniae infection by utilizing the existing knowledge of competence and natural transformation.
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